The actor immediately disassociated himself from the scandal in a public statement.

disassociated 是动词 disassociate 的过去式。disassociate 由前缀 dis-（表示"否定、分离"）和 associate（"关联、联系"）组成，字面意思是"使不再关联"。在句中表示"公开切断联系、划清界限"的意思。